JPS63106474A - Release valve - Google Patents

Abstract

PURPOSE:To enable a valve to instantly full opening/full closing a valve seat by providing two valve seats having a small bore and large bore at the valve seat portion, thereby enabling pressure applied to the valve seat having a large bore to exchange pressures of a supply side and a receive side each other. CONSTITUTION:In the course of a conducting hole 12, the first valve seat 13 and a valve chamber 14 formed by swelling the inner diameter of the conducting hole 12 are located. A cylindrical flow passage 15 is formed in such a way as surrounding the conducting hole 12 on the supply side of the first valve seat 13 from the outside. In the flow passage 15, the release side thereof is intercommunicated with the first valve seat 13 and an annular dam 16 is formed along the periphery of the release side and then the slidable second valve seat 7 is mounted inside the dam 16. The second valve seat 17 is formed in a cylindrical shape and on one end thereof a jar 18 which touches or separates to or from the dam 16 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a relief valve that opens and closes the valve according to changes in pressure within a flow path.

[Prior art]

This type of relief valve is installed, for example, in the middle of a cable, etc., through which fluid such as dry air or nitrogen gas flows from the supply side (upstream side) to the receiving side (downstream side), and the gas pressure on the receiving side is maintained at a predetermined level. When the pressure drops below the specified value, the valve opens to supply gas to the receiving side, and when the pressure rises to a predetermined value, the valve closes to stop the gas supply, thereby ensuring that the gas pressure on the receiving side is always at the predetermined value. This is to ensure that it is kept within the range.

FIG. 4 is a diagram showing a conventional relief valve 1, in which 2 is the supply side and 3 is the receiving side. Reference numeral 4 designates the main body of the relief valve 1, in which a conduction hole 5 is formed that extends from the supply side 2 to the receiving side 3 and extends vertically through the axis. A valve seat 6 and a valve chamber 7 formed by enlarging the inner diameter of the through hole 5 are formed in the middle (center) of the through hole 5.
Inside, a coil spring 8 connects the receiving side 3 to the valve seat 6.
A valve body 9 that is airtightly pressed is housed in a reciprocating manner.

In this relief valve 1, the pressure on the receiving side 3 drops below a predetermined value, and the pressure difference between the supplying side 2 and the receiving side 3 causes a pushing force from the supplying side 2 to the valve body 9. 8, the valve body 9 opens and gas flows from the supply side 2 to the receiving side 3. As a result, the pressure on the receiving side 3 starts to rise, and when the pressure difference reaches a predetermined value or less, the valve body 9 closes and gas flow stops.

However, in the above structure, since the valve seat 6 is single, the pressure at which the valve body 9 opens and closes is almost the same;
When the valve seat 6 opens, the opening is small and the gas flow rate is extremely low, so there is a risk that the pressure on the receiving side 3 will further drop before the valve body 9 is fully opened. In addition, the valve body 9
When closing, the opening degree of the valve body 9 gradually decreases as the pressure on the receiving side 3 approaches a predetermined value, so it takes a considerable amount of time to return to the predetermined pressure.

[Purpose of the invention]

An object of the present invention is to provide a relief valve that solves the above-mentioned problems by making the pressure different when opening and closing the valve so that the opening and closing operations (fully open and fully closed) of the valve body are instantaneously performed. It is also possible to provide.

[Structure of the invention]

For this purpose, the relief valve of the present invention forms a valve chamber and a first valve seat provided on the supply side of the valve chamber in the middle of a communication hole through which fluid flows, and a first valve seat is formed in the valve chamber. the first one above by the spring
A relief device is provided with a valve body that is pressed toward the first valve seat so that the valve body opens and closes the first valve seat based on a difference in pressure between fluids on the supply side and the receiving side of the through hole. In the valve, a flow passage is formed that surrounds the outside of the conduction hole on the side of the first valve seat and communicates with the valve chamber, and a weir is provided in the flow passage, and the flow passage is provided with a weir, and the first valve seat is connected to the flow passage. A second valve seat having a larger diameter and a cylindrical shape is slidably mounted therein, and a collar is provided on the second valve seat to make airtight contact with the above-mentioned valve seat by means of a second spring.

〔Example〕

Embodiments of the relief valve of the present invention will be described below. In this embodiment, two valve seats, one with a small diameter and one with a large diameter, are provided in the valve seat part, and the pressure applied to the large diameter valve seat causes the pressure on the supply side and the receiving side to be mutually exchanged, so that the opening and closing pressure difference of the valve is This enables the valve to fully open and fully close the valve seat in an instant.

In FIGS. 1 to 3, reference numeral 10 indicates a relief valve of this embodiment, which is disposed between the supply side 2 and the receiving side 3. Reference numeral 11 denotes a main body of the relief valve 10, in which a vertically passing through hole 12 is formed. One end of the conduction hole 12 is connected to the supply side 2,
The other end is connected to a cable as the receiving side 3 via a conduit (not shown).

A first valve seat 13 and a valve chamber 14 formed by enlarging the inner diameter of the through hole 12 are formed in the middle of the through hole 12, and the through hole on the supply side 2 of the first valve seat 13 is formed. A cylindrical flow passage 15 is formed so as to surround 12 from the outside. The flow path 15 communicates with the first valve seat 13 on its open side, has an annular weir 16 formed on the outer periphery of the open side, and has a slidable second valve seat 17 loaded inside. There is. The second valve seat 17 is formed in a cylindrical shape, and has a flange 18 formed at one end of its outer circumferential surface that approaches and separates from the above-mentioned type 16.

Reference numeral 19 denotes a coil spring (second coil spring) attached to the flow path 12, one end of which is fixed to the flange 18, and the flange 1
8 is constantly pressed in the direction of type 16 above.

On the other hand, the first valve seat 13 and the second valve seat 17 are moved by a coil spring (first coil spring) 20 inside the valve chamber 14.
A valve body 21 that is pressed in the direction is reciprocatably mounted. The relief valve of this embodiment is configured as described above. Next, its effect will be explained. First, a supply source such as a gas equipped with a flow meter is connected to the end of the supply side 2 of the conduction hole 12, and the end of the receiving side 3 is connected to a cable via a conduit. The supply of gas, etc. can be confirmed using the flow meter mentioned above.

FIG. 1 shows a state in which gas is sufficiently supplied to the cable on the receiving side 3 and the gas pressure in the cable is almost equal to the gas pressure on the supplying side 2, and the valve body 21 is connected to the coil spring 20.
The first valve seat 13 and the second valve seat 17 are pressed to block the communication hole 12, and the gas supply from the supply side 2 to the receiving side 3 is stopped. At this time, there is a gap between the collar 18 and the weir 16, the flow path 12 is in communication with the receiving side 3, and the pressure there is on the receiving side 3.

Next, when the pressure on the receiving side 3 drops to a predetermined value, the force of the coil spring 20 pressing the valve body 21 in the supply side 2 direction with a predetermined load is applied to the opening area of the first valve seat 13. When the pressure on the supply side 2 is balanced and the pressure on the receiving side 3 further decreases, the valve body 21 moves to the receiving side 3 and separates from the first valve seat 13, and accordingly, the second valve seat 17 moves to the receiving side 3 and the collar 18 comes into close contact with the weir 16, the communication between the flow path 15 and the receiving side 3 is cut off, and instead, the flow path 15 is connected to the high pressure supply side 2.
conducts with. As a result, the supply side 2 applied to the valve body 21
The gas pressure of the valve body 21 increases instantaneously because its action surface is expanded from the opening surface of the first valve seat 13 to the opening surface of the second valve seat 17, and therefore the valve body 21 instantly moves to the second valve seat 17. It is fully opened away from the seat 17, and a large amount of gas is supplied to the receiving side 3 (FIG. 2).

When gas is supplied to the receiving side 3 as described above, the gas pressure on the receiving side 3 gradually increases, and first, the gas pressure on the supplying side 2 applied to the valve body 21 and the pushing force of the coil spring 20 increase. is in equilibrium and the pressure horn on the receiving side 3 reaches a predetermined pressure, the valve body 2
1 closes the second valve seat 17 (FIG. 3). When the pressure further increases and the valve body 21 presses the second valve seat 17, the second valve seat 17 also moves, the collar 18 separates from the weir 16, and the flow path 1
5 and the second valve seat 17 are electrically connected to the receiving side 3, and the valve body 21 instantly closes the first valve seat 13 (FIG. 1).

Note that the setting of the operating pressure for opening and closing the valve body 21 is
1 and the elasticity of the coil spring 2o that presses the first valve seat 13
and the ratio of the cross-sectional area (opening area) of each of the second valve seats 17.

〔Effect of the invention〕

From the above, according to the relief valve of the present invention, it is possible to set a difference between the pressure when the valve is open and the pressure when the valve is closed on the receiving side, and the valve can be opened and closed (fully opened and fully opened) instantly. . Therefore, when the pressure of the cable connected to the receiving side drops to the set pressure, gas, etc. is quickly supplied, and when the pressure rises to the set pressure, the supply is stopped instantly, preventing an abnormal drop in the pressure of gas, etc. on the receiving side. It is possible to prevent the cable from being affected by water (for example, flooding).

[Brief explanation of the drawing]

1 to 3 are cross-sectional views of a relief valve according to an embodiment of the present invention, with FIG. 1 showing its fully closed state, and FIG. 2 showing its fully open state.
FIG. 3 shows a state in which the valve body closes only the second valve seat, and FIG. 4 is a sectional view of a conventional relief valve. 2... Supply side, 3... Receiving side, 10... Relief valve,
DESCRIPTION OF SYMBOLS 11... Main body, 12... Conduction hole, 13... First valve seat, 14... Valve chamber, 15... Flow path, 16...
Weir, 17... Second valve seat, 18... Tsuba, 19...
Second coil spring, 20...First coil spring, 21
...valve body.

Claims (1)

[Claims] (1) A valve chamber and a first valve seat provided on the supply side of the valve chamber are formed in the middle of a communication hole through which fluid flows, and a first valve is inserted into the valve chamber by a first spring. In the relief valve, the relief valve is equipped with a valve body that is pressed toward the seat, and is configured such that the valve body opens and closes the first valve seat based on the difference in pressure between the fluid on the supply side and the reception side of the communication hole. , forming a flow passage that surrounds the outside of the conduction hole on the first valve seat side and communicates with the valve chamber, and providing a weir in the flow passage;
Further, a second valve seat having a diameter larger than that of the first valve seat and having a cylindrical shape is slidably loaded in the flow passage, and the second valve seat is brought into airtight contact with the weir by a second spring. A relief valve characterized by a flange.